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UDLD is a Cisco-proprietary protocol but HP, [[Extreme Networks]], and [[Avaya|AVAYA]] all have a similar feature calling it by a different name. HP calls theirs Device Link Detection Protocol (DLDP). Extreme Networks call it Extreme Link Status Monitoring (ELSM) and AVAYA calls theirs, Link-state Tracking. [[Brocade_Communications_Systems|Brocade]]/[[Ruckus Networks]] ICX Switches offer this feature as Uni-Directional Link Detection(UDLD).
Similar functionality in a standardized form is provided as part of the [[Ethernet]] [[OA&M|OAM]] protocol that is defined as part of the [[Ethernet in the
The use of UDLD over 10GbE is augmented, as per 802.3ae/D3.2 standard, when a fault is detected in the physical link:
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==External links==
* [http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a008009477b.shtml Understanding and Configuring the Unidirectional Link Detection Protocol Feature] at [[Cisco Systems]]
* {{cite web |url=https://www.iol.unh.edu/sites/default/files/knowledgebase/10gec/10GbE_fault_signaling.
*http://docs.ruckuswireless.com/fastiron/08.0.30/fastiron-08030-l2guide/GUID-CE29A0CF-07A6-40C3-A999-9AF5FB8AC020.html
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